Mayor Giuliani is looking into whether his top cop dispatched detectives to the home of a Queens woman after she got into a car accident with his wife.

Monica Nascimento, a 25-year-old hotel concierge, claims the detectives showed up at her Astoria home soon after she got into a fender-bender with Police Commissioner Howard Safir’s wife, Carol, on the 59th Street Bridge in 1997.

“The mayor is looking into this,” Giuliani spokeswoman Sunny Mindel said of Nascimento’s claim, which came after the Safirs slapped her with a $1.25 million civil suit this week.

In court papers, Carol Safir says she suffered “serious injuries” after the accident.

The suit also alleges that Nascimento was driving under the influence, and that she fled the scene after the incident.

Nascimento claims she accidentally rear-ended Carol Safir. They got out of their cars and exchanged insurance information after Mrs. Safir identified herself as the commish’s wife and called him on her cell phone, Nascimento says.

Nascimento acknowledges she gave Carol Safir a phony last name, but said she did it because she was scared she’d get into trouble. Within days, detectives visited her house, and another cop called the hotel where she works looking for information about her, she said.

NYPD spokeswoman Marilyn Mode appeared to confirm that the detectives were dispatched, saying, “You won’t seek help from the Police Department if someone gives you a phony name?”

Charges were apparently never filed against Nascimento, who heard about the lawsuit from reporters.

Safir released a statement late yesterday, saying:

“When my wife tried to file an accident report with the police, it was determined that the woman had, in fact, given my wife a false name.

“Luckily, my wife had taken her license-plate number and was able to determine her true identity. Efforts have been made to settle this matter through our insurance company without success.”

Department of Motor Vehicles spokesman Joe Picchi said his office hasn’t found an official report for the accident in their files, which is required by law for an incident that causes personal injury or damage more than $1,000.